EP 1359444 A1 20031105 - Bragg grating assisted waveguide coupler optical add/drop multiplexer
Title (en)
Bragg grating assisted waveguide coupler optical add/drop multiplexer
Title (de)
Optischer Add-Drop-Multiplexer mit Wellenleiterkoppler und Bragg-Gitter
Title (fr)
Multiplexeur optique à insertion-extraction utilisant un coupleur à guides d'onde assisté par réseau de Bragg
Publication
Application
Priority
EP 02253113 A 20020502
Abstract (en)
The invention provides a waveguide coupler optical add/drop multiplexer (OADM) in which the grating can be positioned within the coupling region of a wave guide coupler (48) so as to simultaneously provide fully optimised add and drop functions. The invention overcomes the limitations of the prior art half cycle coupler (HCC) OADMs in which add and drop functions cannot be simultaneously optimised by providing a waveguide coupler with two or more half cycles and carefully designing the grating (50) so that add and drop signals incident in opposite directions into the coupling region have effective reflection points (M1,M2) that coincide with different points along the coupling region at which the lowest order even and odd normal modes are j pi /2 out of phase, where j is an odd integer. It is therefore possible to provide a high specification OADM without optical circulators. The invention may find application in point-to-point links and optical networks. <IMAGE> <IMAGE>
IPC 1-7
IPC 8 full level
G02B 6/12 (2006.01); G02B 6/34 (2006.01); H04J 14/02 (2006.01); G02F 1/313 (2006.01)
CPC (source: EP)
G02B 6/12007 (2013.01); G02B 6/29334 (2013.01); G02B 6/29383 (2013.01); H04J 14/0201 (2013.01); G02B 6/02057 (2013.01); G02B 2006/12107 (2013.01); G02B 2006/12147 (2013.01); G02B 2006/12164 (2013.01); G02F 1/3137 (2013.01); G02F 2201/307 (2013.01); H04J 14/0219 (2013.01)
Citation (search report)
- [X] JP H1152153 A 19990226 - NEC CORP
- [X] OFUSA N ET AL: "AN OPTICAL ADD-DROP MULTIPLEXER WITH A GRATING-LOADED DIRECTIONAL COUPLER IN SILICA WAVEGUIDES", IEICE TRANSACTIONS ON COMMUNICATIONS, INSTITUTE OF ELECTRONICS INFORMATION AND COMM. ENG. TOKYO, JP, vol. E82-B, no. 8, August 1999 (1999-08-01), pages 1248 - 1251, XP001033216, ISSN: 0916-8516
- [A] BAUMANN I ET AL: "COMPACT ALL-FIBER ADD-DROP-MULTIPLEXER USING FIBER BRAGG GRATINGS", IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE INC. NEW YORK, US, vol. 8, no. 10, 1 October 1996 (1996-10-01), pages 1331 - 1333, XP000628949, ISSN: 1041-1135
- [A] ORLOV S S ET AL: "COUPLED-MODE ANALYSIS OF FIBER-OPTIC ADD-DROP FILTERS FOR DENSE WAVELENGTH-DIVISION MULTIPLEXING", OPTICS LETTERS, OPTICAL SOCIETY OF AMERICA, WASHINGTON, US, vol. 22, no. 10, 15 May 1997 (1997-05-15), pages 688 - 690, XP000669408, ISSN: 0146-9592
- [A] ERDOGAN T: "FIBER GRATING SPECTRA", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE. NEW YORK, US, vol. 15, no. 8, 1 August 1997 (1997-08-01), pages 1277 - 1294, XP000720450, ISSN: 0733-8724
- [A] CHAWKI M J ET AL: "Wavelength reuse scheme in a WDM unidirectional ring network using a proper fibre grating add/drop multiplexer", ELECTRONICS LETTERS, IEE STEVENAGE, GB, vol. 31, no. 6, 16 March 1995 (1995-03-16), pages 476 - 477, XP006002593, ISSN: 0013-5194 & US 6226428 B1 20010501 - SAITO TAKASHI [JP], et al
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
DOCDB simple family (application)
EP 02253113 A 20020502